package com.atguigu.gmall.realtime.utils;

import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

/**
 * @author Felix
 * @date 2022/12/19
 * 线程池工具类
 *      双重校验锁解决单例设计模式懒汉式线程安全问题
 */
public class ThreadPoolUtil {
    private static volatile ThreadPoolExecutor executor;

    private ThreadPoolUtil() {
    }

    public static ThreadPoolExecutor getInstance(){
        if(executor == null){
            synchronized (ThreadPoolUtil.class){
                if(executor == null){
                    System.out.println("~~创建线程池对象~~");
                    executor = new ThreadPoolExecutor(4,20,300, TimeUnit.SECONDS,
                        new LinkedBlockingDeque<Runnable>(Integer.MAX_VALUE));
                }
            }
        }

        return executor;
    }
}
